| 摘要 |
PURPOSE: A method for manufacturing styrene-butadiene latex for very early strength modified concrete is provided to prepare latex-modified concrete with improved strength, slump, and air volume. CONSTITUTION: A method for manufacturing styrene-butadiene latex for very early strength modified concrete comprises the steps of: injecting, based on 100 parts by weight of water, 5 ~ 10 parts by weight of butadiene monomer, 10 ~ 15 parts by weight of styrene monomer, 0.3 ~ 0.8 parts by weight of rosin salts as an emulsifier, 0.5 ~ 1.0 parts by weight of potassium persulfate, 0.7 ~ 1.2 parts by weight of t-dodecylmercaptan, and 0.1 ~ 1.0 parts by weight of sodium bisulfate, and initiating the polymerization at 40 ~ 60°C; and injecting, based on 100 parts by weight of water, 25 ~ 30 parts by weight of a butadiene monomer, 0 ~ 55 parts by weight of styrene monomer, 0.5 ~ 1.0 parts by weight of rosin salts as an emulsifier, 3.0 ~ 10.0 parts by weight of polyoxyethylenealkylether-based non-ionic emulsifier, 0.7 ~ 1.2 parts by weight of tertiarydodecylmercaptan, 0.5 ~ 4.5 parts by weight of acide monoer mixture of acrylic acid, methacrylic acid, ethacrylic acid, butacrylic acid, itaconic acid, and fumaric acid, and 0.2 ~ 1.0 parts by weight of antifoaming agent, and polymerizing the mixture at 40 ~ 80°C.
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